package com.baseproject.util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * Created by hp on 2017/6/20.
 */

public class DateUtil {

    /**
     * 计算两个日期之间相差的天数
     * @param smdate 较小的时间
     * @param bdate  较大的时间
     * @return 相差天数
     * @throws ParseException
     */
    public static int daysBetween(Date smdate,Date bdate) throws ParseException
    {
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
        smdate=sdf.parse(sdf.format(smdate));
        bdate=sdf.parse(sdf.format(bdate));
        Calendar cal = Calendar.getInstance();
        cal.setTime(smdate);
        long time1 = cal.getTimeInMillis();
        cal.setTime(bdate);
        long time2 = cal.getTimeInMillis();
        long between_days=(time2-time1)/(1000*3600*24);

        return Integer.parseInt(String.valueOf(between_days));
    }

    /**
     *字符串的日期格式的计算
     */
    public static int daysBetween(String smdate,String bdate){
        LogUtils.d("smdate = " + smdate + "bdate = " + bdate);
        long time1 = 0;
        long time2 = 0;
        try {
            SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            Calendar cal = Calendar.getInstance();
            cal.setTime(sdf.parse(smdate));
            time1 = cal.getTimeInMillis();
            cal.setTime(sdf.parse(bdate));
            time2 = cal.getTimeInMillis();
        } catch (ParseException e) {
            e.printStackTrace();
        }
        long between_days=(time2-time1)/(1000*3600*24);
        return Integer.parseInt(String.valueOf(between_days));
    }

    public static String getCurrentDateString() {
        Date now = new Date();
        SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//可以方便地修改日期格式
        return sdf.format(now);
    }
}
